Desert Gecko wrote:
I've been to many national parks in Utah many times, but I have yet to use a ND there. I do own a nice set and a couple strays, but I've used them for some special effects and a solar eclipse only.
You'll surely use a polarizer, so that's a stop or two already. You probably know that one stop (EV, or exposure value) is the equivalent of half (or double) ISO, or half (or double) shutter speed, or half (or double) whole aperture (if you're not familiar, look up exposure triangle and f-stop sequence - whole f-stops are not the individual clicks on your camera dial). Anyway, by just using a c-pl, you can slow your shutter by half or quarter (depending on the c-pl) without touching ISO or aperture!
What does the 6D max at, 1/8000? At that shutter, at ISO 100 and a mid-range aperture to get that lens sweet spot (perhaps f5.6 or f8), you'll see you don't need an extra piece of glass in front of your lens other than the never-shoot-landscapes-without polarizer. Stop down more to get some depth in your 'scapes and you'd be able to shoot a nuclear explosion without blowing out your highlights.
Mid-day isn't the best time to shoot landscapes anyway, so you might be better off scouting locations for golden hour shots (to be honest, with time limits I've always shot mid-day too, but those shots pale in comparison with golden hour or even blue hour shots.)
You don't need a very slow shutter to get that silky look from flowing water. Anything over about 1/8 second is acceptable, with more silkiness coming with longer exposures. It's a matter of taste, but I think 1/4 to 1/2 second is plenty. You can probably get that in early morning or late evening, stopped down (try not to max your aperture, though, because you'll lose IQ to refraction) with a polarizer, but otherwise, this is probably the only time you might benefit from a ND of a few stops. Keep in mind that most water features in Utah's national parks are in canyons where sunlight is limited to begin with.
Finally, when you say shooting into the sun I assume you mean for sunrise or sunset. You don't need an ND for that. A polarizer might help with some color, though, despite not being at the requisite 45-degree angle from the sun. You could use a graduated ND, but you can easily do that later as needed in Lightroom. Just meter properly and don't meter the sun. Try bracketing if you're unsure. I would set my camera to shoot three-shot brackets about .7EV, probably, to make sure I get one without any blown highlights where I can still pull out the shadows.
Oh, a parting shot: Next time I visit and want to take some pics of the sights without people, I might bring along my Big Stopper. With it I can shoot with a 1-minute exposure to try to remove most of the pesky tourists.
I've been to many national parks in Utah many time... (
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Well, you probably have more experience at this than I do and as I said in my post I don't use ND filters a lot but I do use them and i do like them.
What affects my use of them is that I use both a Cokin system and the more common glass screw-on filters. I like using the polarizer up to the point i need more filtering and at that point I usually just switch over to ND filter since I like the use a graduated ND filter set to the exact height I want in the Cokin filter system (or by holding the ND filter in hand) but I don't like the Cokin polarizer so I can't use them both at the same time.
As far as the misty looking water effect it can be enhanced rather dramatically using ND filters. I don't care that much about that effect so I don't do it much.
Other than than that I have sort of reached the limits of my experience with ND filters so I can't offer any more suggestions.